Explain some of the factors that make it difficult for geologists to learn about the Precambrian era?

2 answers:

8 0

There is not much Precambrian strata preserved and very few species. At this particular time, the earth, and the creatures in it, were still evolving and fossils were difficult to trace and record. There was also a noted mass extinction that occurred. Also, many Precambrian rocks have been heavily metamorphosed<span>, obscuring their origins, while others have been destroyed by erosion, or remain deeply buried beneath Phanerozoic strata</span>

larisa86 [58]3 years ago

4 0

The Precambrian era is the earliest part of Earth's history. During the early Precambrian era, there were only single celled, and microscopic organisms which were virtually impossible to preserve. Later on sea life evolved into other organisms, such as jelly fish, sea cucumbers, and snails, but they are all soft tissue animals leaving behind no skeletons. Whatever shells, or fossils MIGHT have been left behind metamorphosed into other things.

You might be interested in

What is the most basic unit of life?

Contact [7]

Answer:

cell

Explanation:

cell is the basic unit of life

5 0

3 years ago

PLEASE HELP!!!!!!!!!!!

kati45 [8]

Environmental science addresses recycling strategy so we utilize our natural resources efficiently. It also provides us with knowledge on how to lead an eco-friendly lifestyle

6 0

4 years ago

Read 2 more answers

/You and your friend are trapped in an overturned ship. To escape you must swim underwater a long distance. You tell your friend

lora16 [44]

Answer:

yes it would be correct

Explanation:

Hyperventilating can slow the co2 level in the body dramatically, it reduce the need for your body to that regular amount of oxygen all the time. Your friend is partly right but at some point you will need to come up for air

6 0

3 years ago

Read 2 more answers

Suppose that when you examined your tubes (in this exercise) after incubating them, you noticed that the unsealed control contai

aivan3 [116]

The Oxidation-Fermentation Test is used to differentiate bacteria built on their capability to oxidize or ferment specific sugars.
Once microbes are inoculated,-One tube is sealed with a layer of sterile mineral oil to promote anaerobic growth and fermentation.-The other tube is left unsealed to allow aerobic growth and oxidation.
Organisms able to ferment the carbohydrate or ferment and oxidize the carbohydrate will turn the sealed and unsealed yellow throughout.
Organisms able only to oxidize the sugar will turn the unsealed yellow medium and leave the sealed medium green or blue.
Fragile fermenters will convert both tubes slightly yellow at the top.
Organisms not able to metabolize the sugar will either produce no color change or will turn the medium blue due to alkaline products from amino acids degradation.
Since Pair #1 showed complete yellowing for sealed and unsealed, these Organisms able to ferment the carbohydrate or ferment and oxidize the carbohydrate. So our interpretation will be that the organism has: Oxidation and fermentation OR fermentation only.
For tubes #2 and #3, the sealed tubes were green throughout suggests that they need oxygen for aerobic growth, and the fact that their unsealed tubes showed light yellowing is evidence for oxidation. Sealed - Green and Unseal - Yellow. Our interpretation for these pairs of tubes would be : Oxidation
Tube 1 can be either Oxidation and fermentation OR fermentation only. So reliability of this needs to be confirmed more with additional testing.
Tubes 2 and 3 are most reliable because they can only be oxidation only and no fermentation.

6 0

3 years ago

In a particular breed of cattle, the trait of not having horns (Pp) is dominant over having horns (pp). The Punnett square below

muminat

Answer:

C.50%

Explanation:

3 0

3 years ago